There are three ways (at least) of describing an instrument's pitch range alphanumerically.
One is standard for pedal harps and relates to the top note, and which octave (from F to the next E above). For example, C1 would be the C in the first complete octave F to E at the top. (There's actually one higher on the pedal harp - #0, and a G above that - #00.)
I find this system difficult for non-pedal harp players but I put it in parentheses after the one I prefer for all you pedal harp players.
There's another system called International Pitch Notation which starts with A0 at the bottom, in the next octave below the low F shown below. Confused?
That's why, over the years, I've used the system which is symmetric around Middle C, a note to which we can relate. Middle C, is written as just plain "C." "C superscript 1" is the first C above middle C, and "C subscript 1" is the first C below Middle C. Easier, huh?
It can be awkward to do superscript and subscript on a web page. So I use lower case to indicate octaves above middle C. So, "a2" is the same as "A superscript 2."
